Inter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography

Zeyad Alzaben, 1 Yazan Gammoh, 1, 2 Marta Freixas, 1 Ahmad Zaben, 3 Miguel A Zapata, 4 Dana N Koff 2 1Department of Optometry, Opticalia Clinic, Olot, Spain; 2Department of Optometry Science, Faculty of Allied Medical Sciences, Al-Ahliyya Amman University, Amman, Jordan; 3Optipunt Eye Clinic, Fig...

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Autores principales:	Alzaben Z, Gammoh Y, Freixas M, Zaben A, Zapata MA, Koff DN
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2020
Materias:	anterior corneal aberrations high order aberrations inter-ocular asymmetry zernike analysis Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/8dc3cbe1065241b19cac0075365bf00c
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spelling	oai:doaj.org-article:8dc3cbe1065241b19cac0075365bf00c2021-12-02T10:49:13ZInter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography1177-5483https://doaj.org/article/8dc3cbe1065241b19cac0075365bf00c2020-05-01T00:00:00Zhttps://www.dovepress.com/inter-ocular-asymmetry-in-anterior-corneal-aberrations-using-placido-d-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Zeyad Alzaben, 1 Yazan Gammoh, 1, 2 Marta Freixas, 1 Ahmad Zaben, 3 Miguel A Zapata, 4 Dana N Koff 2 1Department of Optometry, Opticalia Clinic, Olot, Spain; 2Department of Optometry Science, Faculty of Allied Medical Sciences, Al-Ahliyya Amman University, Amman, Jordan; 3Optipunt Eye Clinic, Figueres, Spain; 4Ophthalmology Department, Vall d’Hebron Hospital, Barcelona, SpainCorrespondence: Zeyad AlzabenDepartment of Optometry, Opticalia Clinic, (Plz/Clarà, 12), Olot, Catalonia 17800, SpainTel +34 678922564Email drzaben@yahoo.comObjective: Inter-ocular asymmetry in anterior corneal high-order aberrations has previously not been investigated. This study aims to investigate the normal range of inter-ocular asymmetry in corneal high-order aberrations (HOAs) using a Placido disk-based corneal topographer to explore the relationship between the HOA parameters of the anterior corneal for each eye individually and the refractive error.Patients and Methods: A total of 257 subjects (98 males and 159 females) were participated, with an age range of 6 to 81 years (average of 40.2 ± 17.53). Participants were divided into three groups: myopia (spherical equivalent (SEQ) of refraction ≥− 0.50 D), hypermetropia (SEQ ≥+0.50 D), and emmetropia. For all patients, high-order aberrations were measured using a corneal topographer (CA.200TM; Topcon). Inter-ocular asymmetry was represented by RMS (root mean square) for three, five, and seven mm as pupil entry; aberrations for five mm pupil (vertical and oblique trefoil, vertical and horizontal comma, and primary spherical aberration) were recorded using the instrument’s built-in software.Results: Hypermetropes exhibit the highest inter-ocular asymmetry of all RMS values, mostly in spherical aberrations, and higher-order trefoil values. Oblique trefoil aberrations had the highest interocular asymmetry in the myopic groups. The interocular asymmetry in horizontal coma values was the highest in emmetropes and the lowest in hypermetropes.Conclusion: To our knowledge, this is the first observational study of inter-ocular differences in high-order aberrations of the anterior corneal surface of the human eye. This study’s results could be used to establish normal values of inter-ocular asymmetry of HOAs of the anterior cornea. The use of such normal values should be investigated further to serve as a guideline for clinicians when establishing the best management route for the patient’s refractive error.Keywords: anterior corneal aberrations, high-order aberrations, inter-ocular asymmetry, Zernike analysisAlzaben ZGammoh YFreixas MZaben AZapata MAKoff DNDove Medical Pressarticleanterior corneal aberrationshigh order aberrationsinter-ocular asymmetryzernike analysisOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 14, Pp 1451-1457 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	anterior corneal aberrations high order aberrations inter-ocular asymmetry zernike analysis Ophthalmology RE1-994
spellingShingle	anterior corneal aberrations high order aberrations inter-ocular asymmetry zernike analysis Ophthalmology RE1-994 Alzaben Z Gammoh Y Freixas M Zaben A Zapata MA Koff DN Inter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography
description	Zeyad Alzaben, 1 Yazan Gammoh, 1, 2 Marta Freixas, 1 Ahmad Zaben, 3 Miguel A Zapata, 4 Dana N Koff 2 1Department of Optometry, Opticalia Clinic, Olot, Spain; 2Department of Optometry Science, Faculty of Allied Medical Sciences, Al-Ahliyya Amman University, Amman, Jordan; 3Optipunt Eye Clinic, Figueres, Spain; 4Ophthalmology Department, Vall d’Hebron Hospital, Barcelona, SpainCorrespondence: Zeyad AlzabenDepartment of Optometry, Opticalia Clinic, (Plz/Clarà, 12), Olot, Catalonia 17800, SpainTel +34 678922564Email drzaben@yahoo.comObjective: Inter-ocular asymmetry in anterior corneal high-order aberrations has previously not been investigated. This study aims to investigate the normal range of inter-ocular asymmetry in corneal high-order aberrations (HOAs) using a Placido disk-based corneal topographer to explore the relationship between the HOA parameters of the anterior corneal for each eye individually and the refractive error.Patients and Methods: A total of 257 subjects (98 males and 159 females) were participated, with an age range of 6 to 81 years (average of 40.2 ± 17.53). Participants were divided into three groups: myopia (spherical equivalent (SEQ) of refraction ≥− 0.50 D), hypermetropia (SEQ ≥+0.50 D), and emmetropia. For all patients, high-order aberrations were measured using a corneal topographer (CA.200TM; Topcon). Inter-ocular asymmetry was represented by RMS (root mean square) for three, five, and seven mm as pupil entry; aberrations for five mm pupil (vertical and oblique trefoil, vertical and horizontal comma, and primary spherical aberration) were recorded using the instrument’s built-in software.Results: Hypermetropes exhibit the highest inter-ocular asymmetry of all RMS values, mostly in spherical aberrations, and higher-order trefoil values. Oblique trefoil aberrations had the highest interocular asymmetry in the myopic groups. The interocular asymmetry in horizontal coma values was the highest in emmetropes and the lowest in hypermetropes.Conclusion: To our knowledge, this is the first observational study of inter-ocular differences in high-order aberrations of the anterior corneal surface of the human eye. This study’s results could be used to establish normal values of inter-ocular asymmetry of HOAs of the anterior cornea. The use of such normal values should be investigated further to serve as a guideline for clinicians when establishing the best management route for the patient’s refractive error.Keywords: anterior corneal aberrations, high-order aberrations, inter-ocular asymmetry, Zernike analysis
format	article
author	Alzaben Z Gammoh Y Freixas M Zaben A Zapata MA Koff DN
author_facet	Alzaben Z Gammoh Y Freixas M Zaben A Zapata MA Koff DN
author_sort	Alzaben Z
title	Inter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography
title_short	Inter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography
title_full	Inter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography
title_fullStr	Inter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography
title_full_unstemmed	Inter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography
title_sort	inter-ocular asymmetry in anterior corneal aberrations using placido disk-based topography
publisher	Dove Medical Press
publishDate	2020
url	https://doaj.org/article/8dc3cbe1065241b19cac0075365bf00c
work_keys_str_mv	AT alzabenz interocularasymmetryinanteriorcornealaberrationsusingplacidodiskbasedtopography AT gammohy interocularasymmetryinanteriorcornealaberrationsusingplacidodiskbasedtopography AT freixasm interocularasymmetryinanteriorcornealaberrationsusingplacidodiskbasedtopography AT zabena interocularasymmetryinanteriorcornealaberrationsusingplacidodiskbasedtopography AT zapatama interocularasymmetryinanteriorcornealaberrationsusingplacidodiskbasedtopography AT koffdn interocularasymmetryinanteriorcornealaberrationsusingplacidodiskbasedtopography
_version_	1718396604064464896

Inter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography

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